Open Lecture by Haakon Andresen: Gravitational waves: Ripples in Space and Time and a New Way to Understand the Universe.

Gravitational waves can be used to study astrophysical objects such as black holes, neutron stars and the chaotic death of huge stars. Einstein's general theory of relativity is explored using paper and a beach ball. What are gravitational waves, how do we measure them and why astrophysicists are so interested in them.